Butyric acid , Analysis standard , 107-92-6
Synonym(s):
Butanoic acid;Butyric acid
CAS NO.：107-92-6
Empirical Formula: C4H8O2
Molecular Weight: 88.11
MDL number: MFCD00002814
EINECS: 203-532-3
PRODUCT Properties
| Melting point: | ?6-?3 °C (lit.) |
| Boiling point: | 162 °C (lit.) |
| Density | 0.964 g/mL at 25 °C (lit.) |
| vapor density | 3.04 (vs air) |
| vapor pressure | 0.43 mm Hg ( 20 °C) |
| refractive index | n |
| FEMA | 2221 | BUTYRIC ACID |
| Flash point: | 170 °F |
| storage temp. | Store below +30°C. |
| solubility | Chloroform (Soluble), Isopropanol (Sparingly), Methanol (Slightly);Miscible with water, Propylene glycol, Glycerin, alcohol and oils. |
| pka | 4.83(at 25℃) |
| form | Liquid |
| Specific Gravity | 0.960 (20/4℃) |
| color | Clear colorless |
| PH | 3.94(1 mM solution);3.42(10 mM solution);2.92(100 mM solution); |
| Odor | at 1.00 % in dipropylene glycol. sharp acetic cheese butter fruit |
| Odor Type | cheesy |
| Odor Threshold | 0.00019ppm |
| explosive limit | 2-12.3%(V) |
| Water Solubility | MISCIBLE |
| JECFA Number | 87 |
| Merck | 14,1593 |
| BRN | 906770 |
| Dielectric constant | 3.0（Ambient） |
| Stability: | Flammable. Incompatible with strong oxidizing agents, aluminium and most other common metals, alkalies, reducing agents. |
| InChIKey | FERIUCNNQQJTOY-UHFFFAOYSA-N |
| LogP | 1.1 at 25℃ |
Description and Uses
Butyric acid is a carboxylic acid also classified as a fatty acid. It exists in two isomeric forms as shown previously, but this entry focuses on n-butyric acid or butanoic acid. It is a colorless, viscous, rancid-smelling liquid that is present as esters in animal fats and plant oils. Butyric acid exists as a glyceride in butter, with a concentration of about 4%; dairy and egg products are a primary source of butyric acid. When butter or other food products go rancid, free butyric acid is liberated by hydrolysis, producing the rancid smell. It also occurs in animal fat and plant oils.
Butyric acid is used in the preparation of various butyrate esters. Low-molecular-weight esters of butyric acid, such as methyl butyrate, have mostly pleasant aromas or tastes. As a consequence, they find use as food and perfume additives. It is also used as an animal feed supplement, due to the ability to reduce pathogenic bacterial colonization. It is an approved food flavoring in the EU FLAVIS database (number 08.005).
Due to its powerful odor, it has also been used as a fishing bait additive. Many of the commercially available flavors used in carp (Cyprinus carpio) baits use butyric acid as their ester base; however, it is not clear whether fish are attracted by the butyric acid itself or the substances added to it. Butyric acid was, however, one of the few organic acids shown to be palatable for both tench and bitterling. The substance has also been used as a stink bomb by Sea Shepherd Conservation Society to disrupt Japanese whaling crews, as well as by anti-abortion protesters to disrupt abortion clinics.
Safety
| Symbol(GHS) |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H302-H314 |
| Precautionary statements | P270-P280-P301+P312-P301+P330+P331-P303+P361+P353-P305+P351+P338 |
| Hazard Codes | C,Xi |
| Risk Statements | 34 |
| Safety Statements | 26-36-45 |
| RIDADR | UN 2820 8/PG 3 |
| WGK Germany | 1 |
| RTECS | ES5425000 |
| F | 13 |
| Autoignition Temperature | 824 °F |
| Hazard Note | Irritant |
| TSCA | Yes |
| HS Code | 2915 60 19 |
| HazardClass | 8 |
| PackingGroup | III |
| Toxicity | LD50 orally in rats: 8.79 g/kg (Smyth) |
